package com.own.utils;

import java.security.MessageDigest;

/**
 * MD5加密Java实现类
 * <p>Title: </p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2007</p>
 * <p>Company: eMan</p>
 * @author 朱泽江
 */
public class MD5{

  public final static String encode(String s) {
    char hexDigits[] = {
        '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd',
        'e', 'f'};
    try {
      byte[] strTemp = s.getBytes();
      MessageDigest mdTemp = MessageDigest.getInstance("MD5");
      mdTemp.update(strTemp);
      byte[] md = mdTemp.digest();
      int j = md.length;
      char str[] = new char[j * 2];
      int k = 0;
      for (int i = 0; i < j; i++) {
        byte byte0 = md[i];
        str[k++] = hexDigits[byte0 >>> 4 & 0xf];
        str[k++] = hexDigits[byte0 & 0xf];
      }
      return new String(str);
    }
    catch (Exception e) {
      return null;
    }
  }

  public static void main(String[] args) {
    //return hex_md5("abc") == "900150983cd24fb0d6963f7d28e17f72";
    System.out.print(MD5.encode("123"));
  }
}
